Art of mounting electron image tubes



April 1950 M. B. HERSCHER 5% AL 2,505,736

I ART 0F MOUNTING ELECTRON IMAGE TUBES Filed Feb. 14, 1947 2 Sheets-Sheet 1 w 2- INVENTORS:

ATTORNEY April 5, 1950 M. a. HERSCHER ET Al. 2,505,736

ART OF MOUNTING ELECTRON IMAGE TUBES Filed Feb. 14, 1947 2 Sheets-Sheet 2 57 MTTORNEY Patented Apr. 25, 1950 ART OF MOUNTING ELECTRON IMAGE TUBES Marcus B. Herscher, Camden, and Raphael F.

Bov, Oaklyn, N. J assignors to Radio corporation of America, a corporation of Delaware Application February 14, 1947,. Serial No. 7253,654

4 Claims.

This invention relates to-theartof mounting electron;, tubes, particularly: so,-.c,a1led ,imagev tubes, and wiltbe described as applied. to the mounting of a cathode-ray tube in the..cabinet of .an; oscilloscope.

The cathode-raytubes employed. in modern osoilloscon s may. be;-1; rovidedv with electron-. sensitive screens of, various types. Thus, one cathode-ray tube maybe provided with a conventional green (Willemite) screen, another with a black and white .(zinc cadmium sulphides) screen and still .others..-..with-- long persistence- (dual layer, cascade-phosphor) or short-pen sistence (single layer, activated) screens. Since the different.electrical testsfor which the oscilloscope is designed may dictate the use of different cathode-ray tubes it is obviously desirable to make some provision for facilitating the substitution of one tube for another.

Accordingly, the principal object of the present invention is to provide an improved cabinetmounting for cathode-ray and other imagetubes, and one wherein thetube'may be entered into and withdrawn from the cabinet of theunit through the Window tow-hich the-screen of the tube is presented.

In the accompanyingdrawings: Fig. l is a-top plan View, partlybroken away, of anoscilloscope cabinet containing a cathode-ray tube mounted in accordance with the principle of the present invention, Fig. 2 is 'a sideyelevation, with, the cabinet broken-away, of the tube mounting; Fig; 3 is a sectional view taken on the line III-III of Fig. 4 showing the screen -end oi the tube and a removable light-shield therefor, Fig.

4 is a front elevation of the screen and lightshield and Fig. 5 is a rear View, in partial section, taken on the line V-V of Fig. 2.

In the cathode-ray oscilloscope shown in the accompanying drawings I designates, generally, the control panel of a cabinet 2 within which the cathodeay tube 3 and other electrical parts 4 of the unit are housed. The control panel I is at the front of the cabinet and contains an aperture or window 5 of a diameter sufficiently large to permit the tube 3 to be entered into the cabinet I and through which the fluorescent screen 6 of the tube 3 may be viewed when the tube is mounted within the cabinet. This wii dow 5 normally contains an escutcheon in the form of a tubular soft-rubber or felt shell I which extends beyond the inner and outer surfaces of the panel I whereby it serves both as a light-shield for the fluorescent screen 6 (see Fig. 3) and as a stationary support for the screennd of-t etub 3- 0iv v more c ear1y;in;,s.; F 4 the p r p ryso ..=w n o r s pr vided-.1; with three slotsorkeyways 8a, 8b, 8c. ,Spaced 1;2 0 apa tan e ul p rti s eld] n1... provided onits outer surface with three similarly spaced keys 3a,, 9b, 9c whichawhen turned; by rotating theshield serve to lock the said member I within the window 5. If desired, a,,- spl t-ring I23 ,(Figs. 3 and 4) may be provided on; theinterior of thetubular shield Lior remoyably securing a transparent chart II adjacent tothe I screen-end of the tube 3. H (Such: charts. are;.; mme p y n,c hodeer yo c sc p s.1. for measuring the- ;horizontal andvertical come, ponents of the pattern; traced by; theelectron beam upon the fluorescent screen, of the tube);

The cathode-ray tube. 3, here shown, is of-a. conventional shape andincludes, in addition to: its bulbous screen-portion, a dependent neckw portion 3a which terminates in a base 12 through which the electrodeterminals J3 (Figs. 1 and 2) ofthe tube project. Electrical connections are made to the tube terminals l3 through a socket i l: which is mounted, inaccordance with they; present invention, for movement along a path normal to the plane offlthe windowii. The care riage in the instant case comprises simply a flat metalplate I5 .whieh ,is mounted for slidable movement on aninverted .urshape pedestal I8. Two screws or similar; projections I1 ,andIIi on the flat ;top of thepedestal Mint in parallellym arranged slots I8. and l8' in the plate or carriage Idand serveto-guicle and to limit its forward and rearward movement. Two struts l9 and I9 affixed at one end to the pedestal I6 and at the other end to the rear surface of the front panel I serve to brace the assembly and, further, serve as a convenient anchor for the forward ends of two coil springs 26 and 20 which are connected at their inner ends to the carriage I5 and serve to bias the said movable support to its forward position.

The slidable plate it carries, in addition to the socket I4, a funnel-shape metal magneticshield 2! within which the cathode-ray tube 3 is received. In the instant case (see Fig. 5), the shield 2| is welded or otherwise permanently affixed to the plate I5 and carries two oppositely located, outwardly extending arms 22 and 22, each of which is provided With a vertically extending arcuate slot 23, 23', respectively. The socket l4 within which the electrode terminals I3 of the tube are received is held, as by means of a screw 24, in a clamp 25 and the clamp is mounted by means of integral ears 26, 26' and pins ill, 21" in the arcuate slots 23, 23, to permit of a limited degree of rotary movement. Such freedom of rotary movement facilitates alignment of the socket terminals with the tube terminals, while the tube is being inserted in the socket H1.

The following procedure is recommended in removing the image tube 3 from the cabinet; (a) Turn the light shield i slowly until the keys 9a etc. thereon snap into the keyways 8a etc. and the shield starts to move forward, (1)) remove the light shield, (c) grasp the screen-end of the tube 3 and pull it forward and out through the window 5.

To mount the tube (3) in the cabinet 2, (a) pass the tube, neck-end first, through the window 5, all the way into the tube shield I, (b) turn the tube about its long axis, to bring its prongs into register with the socket terminals (the prongs are properly registered when the said rotary movement is halted) and then push to seat the said prongs in the socket, (c) gradually release the force required in seating the prongs and thereby permit the tube to move forward on the carriage E5 under the influence of the springs 20, 20', (d) place the light shield 1 against the screen-end of the tube, line-up the keys 9a, etc. with the keyways 8a, etc., press in, (e) turn the shield to lock it in position. When the tube is energized the pattern on its screen (when observed in conjunction with the chart :1) may indicate that the horizontal and vertical axes of the tube are not properly located. In this case, turn the light shield '1 in the direction necessary to provide the proper adjustment and, if the adjustment is still not achieved, place a hand through the open center of the said shield, push against the tube (to relieve the force of the biasing springs 20, 20) and turn the tube in the proper direction.

It will now be apparent that the present invention provides an improved mounting for cathode ray and other image tubes and one wherein the tube may be entered and withdrawn from the cabinet of the unit through the window to which the screen of the tube is presented.

What is claimed is:

1. Electrical apparatus comprising a cabinet adapted to accommodate an electron-image tube and having a window through which said tube may be entered into said cabinet, a, socket for said tube mounted for movement within said cabinet in register with said window whereby said tube may be entered into said cabinet through said window and seated in said socket, a removable escutcheon for said window in which the screen of said image-tube is adapted to be framed, and means for moving said socket and hence said tube toward said window whereby to frame said tube-screen in said escutcheon 2. The invention as set forth in claim 1 and wherein said removable escutcheon is constituted of a yieldable material and comprises a stationary support for the screen-end of said image tube.

3. The invention as set forth in claim 2 and wherein said stationary support extends beyond the exterior surface of said cabinet and comprises a light-shield for the screen of said image tube.

4. Electrical apparatus comprising a cabinet adapted to accommodate an electron-tube of the type having a viewing-screen adjacent to one end and electrode terminals projecting from its other end, said cabinet having a window through which said tube may be passed, a carriage for said tube mounted for slideable movement in said cabinet in line with said window, a socket for said electrode terminals mounted to permit of a limited degree of rotary movement on said carriage whereby said socket may be oriented to receive said electrode terminals, an apertured support for said screen-end of said tube removably mounted in said window, and means for moving said carriage and hence said tube toward said window whereby to bring said screen-end of said tube into engagement with said apertured support.

MARCUS B. HERSCHER. RAPHAEL F. BOV.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,047,020 Flaherty July 7, 1936 2,260,721 Linsell Oct. 28, 1941 2,285,509 Goshaw June 9, 1942 2,388,761 Patterson, Jr Nov. 13, 1945 2,424,513 Stephan July 22, 1947 FOREIGN PATENTS Number Country Date 309,334 Italy July 3, 1933 459,355 Great Britain Jan. 6, 1937 528,198 Great Britain Oct. 24, 1940 

